Final answer:
The Great Compromise, also known as the Connecticut Compromise, decided the structure of Congress by proposing a bicameral system with different apportionments in each house.
Step-by-step explanation:
The compromise that decided the structure of Congress was the Great Compromise. This compromise, also known as the Connecticut Compromise, proposed a bicameral congress with different apportionments in each house.
The upper house, the Senate, would have two members from each state, while the lower house, the House of Representatives, would have representation based on the population of each state.