Answer: The U.S entered the war because they were afraid communism was going to spread
Explanation: Hope this helps :)
Disease (The harsh winter that killed around half of the men)
Lack of organizational skill (ex. not having set Religious practices as they did in Britain, sending over only mean, not being well prepared in general)
Greed (especially in the gold industry)
Some ill relations with the Indians (although the first Thanksgiving was mostly peaceful, some problems arose)
I hoped I helped(: but I give you only 4