Under America’s first governing document, the Articles of Confederation, the national government was weak and states operated like independent countries. At the 1787 convention, delegates devised a plan for a stronger federal government with three branches—executive, legislative and judicial—along with a system of checks and balances to ensure no single branch would have too much power.
Hope this made sense!
D) it extended support to elderly citizens
The ruler of Japan invaded to secure his legacy and make sure he was remembered I believe.