The Involvement of the United States in WW2 was the attack on pearl harbour by the Japanese who where in a alliance with Germany so the domino effect took place once The USA declared war on Japan Germay retaliated by declaring war on The US
Explanation:
Decmber 7 1941 suprise attack from the Japanese
caused a domino's affect as japan was member of the pact of steel an alliance between Germany and Japan
Because Japan was trying to invade the Philippines and US was allies with the Philippines the US had to get involved and help them and since Japan wouldn't give up and hit the US aka Pearl Harbor it led to war
<span>A hunter-gatherer or forager[1] society is one in which most or all food is obtained from wild plants and animals, in contrast to agricultural societies, which rely mainly on domesticated species.</span>
Since they have just gotten over war and money was good for one side but they had lack of money on the other side. From that case it was hard for them to agree over each other whether they could trade or not.
Okay I only know 2 things: The sinking of the Lusitania and Zimmerman Telegram. What started the war the ruler of the ottoman empire was assassinated and what expanded the war was the Zimmerman telegram.