The Constitutional Convention of 1787 was a turning point in United States history because it replaced a weak national framework with a stronger federal system. Delegates met in Philadelphia during the summer to fix the Articles of Confederation, but they soon decided that a new Constitution was needed. Their debates shaped the structure of Congress, the presidency, the courts, and the balance of power between states and the national government.
The Convention matters because many arguments from 1787 still influence American politics today.
The meetings were held in secrecy so delegates could speak freely, change their minds, and make compromises without immediate public pressure. Major conflicts included representation for large and small states, the role of slavery, the power to tax, and how to prevent any one branch from becoming too powerful. Compromises such as the Great Compromise and the Three-Fifths Compromise helped secure agreement, even though they also preserved deep conflicts.
The final Constitution created a system of federalism, separation of powers, checks and balances, and a process for ratification by the states.
Key Facts
- The Convention met in Philadelphia from May 25 to September 17, 1787.
- The original goal was to revise the Articles of Confederation, but delegates wrote a new Constitution instead.
- The Great Compromise created a bicameral Congress: equal representation in the Senate and population-based representation in the House.
- The Three-Fifths Compromise counted three-fifths of enslaved people for representation and taxation, written as enslaved population counted = 3/5 of total enslaved people.
- The Constitution needed approval from 9 of 13 states to take effect, so the ratification threshold was 9/13.
- The Constitution divided power through federalism, separation of powers, and checks and balances.
Vocabulary
- Constitutional Convention
- The 1787 meeting in Philadelphia where delegates drafted the United States Constitution.
- Articles of Confederation
- The first national government plan of the United States, which gave most power to the states and left the central government weak.
- Federalism
- A system of government in which power is shared between a national government and state governments.
- Great Compromise
- The agreement that created a two-house Congress with equal state representation in the Senate and population-based representation in the House.
- Ratification
- The formal approval process by which states accepted the Constitution.
Common Mistakes to Avoid
- Saying the Convention only revised the Articles of Confederation is wrong because delegates went beyond revision and created an entirely new Constitution.
- Assuming all states supported the Constitution immediately is wrong because ratification required heated debates between Federalists and Anti-Federalists.
- Thinking secrecy meant the Convention was unimportant is wrong because secrecy allowed delegates to negotiate difficult compromises without daily public pressure.
- Confusing the Virginia Plan and New Jersey Plan is wrong because the Virginia Plan favored population-based representation, while the New Jersey Plan favored equal representation for each state.
Practice Questions
- 1 The Convention began on May 25 and ended on September 17, 1787. About how many days did the Convention last?
- 2 The Constitution required ratification by 9 of 13 states. What fraction and approximate percentage of the states had to approve it?
- 3 Explain why delegates from large states and small states disagreed about representation in Congress, and describe how the Great Compromise addressed both concerns.