Whigs opposed the war because many of them thought that going to war with mexico would encourage slavery expansion and allow the US to gain new southwest territories
It strengthened Fidel Castro's position. The bay of pigs was a failed attempt to remove him from power. When it failed the U.S was exposed as trying to start a revolution with one of their "allies". This really hurt the U.S in the future because it led other countries not to trust them.
Answer:
Seward refusing to protest Alexander II's destruction of the Polish uprising
Woodrow Wilson's initial apprehesnion at joining WW1
Extra example: Franklin Roosevelt's refusal to overtly join the Allied Powers in early WW2.
Because the bill has to go through the House of representatives then get passed to the president by the bill may become vetoed making it hard for bills to become laws.
Pontiac lead a rebellion against british following the french and indian war because the british created several policies that offended the tribes, because they keep taking the tribe's land and power, causing them to feel dishonored by the colonies
hope this helps