The direct cause of u. s. involvement in world war ii was

a)
germany's invasion of poland.

b)
the japanese attack on pearl harbor.

c)
sinking of the lusitania by germany.

d)
italian mistreatment of foreign nationals by the us.

history

The answer is choice B, the Japanese attack on pearl harbor.

While the German invasion of Poland is considered the start of World War II in Europe, the United States kept its neutrality for the next two years (even through the German air attack on Britain) until the Japanese attack on Pearl Harbor. The sinking of the passenger ship Lusitania was one of a number of issues that led to American involvement in World War I.

the answer is b. osage.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".