A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
We're highlighting five signature cities, Boston, New York, Philadelphia, Charleston and Washington, D.C., for their individual roles in defining America’s legacy. Washington, DC will be the centerpiece of America’s 250th celebration.
Celebrate 250 years of American history by supporting programs that honor our past and shape our future. Your donation will help to make the America250 commemoration truly unforgettable.
Celebrate America's 250th anniversary with the Department of Homeland Security. Explore events, stories, and milestones leading up to July 4, 2026.
National Events Calendar The Freedom 250 Network is celebrating the Nation’s 250th birthday with events that honor our history, showcase the beauty of the United States, ignite innovation, and strengthen the faith that will carry our Nation forward for the next 250 years. Your journey begins here—explore the events and join the celebration.
America 250 Countdown to America's 250th Anniversary On July 4, 2026, America will celebrate the most important milestone in our country’s history—250
Founding father Benjamin Franklin, often called the first diplomat, communicated with sympathizers in Britain and sought military assistance from France and Spain. The colonists’ quest for freedom became a global cause. Follow the stories of America’s road to independence and 250 years of history.
The White House Task Force on Celebrating America’s 250th Birthday (Task Force 250) was created on January 29, 2025 by executive order of US president Donald Trump.
Under its Declaration250 branding, the National Archives will be celebrating the ideals of equality and liberty enshrined in the Declaration of Independence and commemorating 250 years of United States resilience and the pursuit of happiness.
America Turns 250: A Guide to the ing Festivities Girl Scouts singing folk songs, a flag waving party and a Times Square ball drop are among the planned Semiquincentennial celebrations.
America250, the official nonpartisan entity charged by Congress with planning the 250th anniversary of the signing of the Declaration of Independence, has announced a series of national tentpole programs and events to commemorate and celebrate the semiquincentennial of the United States.
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