Answer:
The French and Indian War began in 1754 and ended with the Treaty of Paris in 1763. The war provided Great Britain enormous territorial gains in North America, but disputes over subsequent frontier policy and paying the war's expenses led to colonial discontent, and ultimately to the American Revolution.
The one that was a factor in the U.S entry in world war I was :
B. the sinking of the Lusitania
They wanted to help Europe and their allies recover from the War. In order to help Europe recover from the war, the United States came up with the Marshall Plan. It is named after Secretary of State George Marshall. The Marshall Plan offered help and finances to European countries in order to recover from World War II.
The primary accomplishment of the First Continental Congress was a compact among the colonies to boycott British goods beginning on December 1, 1774, unless parliament should rescind the Intolerable Acts.
I think that the WW1 started because of Arduke Franz Ferdinand since a seberian man shot him in the throat and his wife Sophie in the stomach on their wedding anniversary in Sarajevo, and then Austro-Hungary started was on Serbia and then many other countries joined in.
