The Mexican American war was stemmed from the annexation of the Republic of Texas by the U.S. in 1845 and from a dispute over whether Texas ended at the Nueces River.
That is all the info I can give you maybe rephrase the question differently or something
Answer:
the ideas of Frederich Engles and Karl Marx because it was in Russian Revolution only
People began to question the government like the kings and queens of France. This caused Rebellions to form and then the revolution happened
Answer:
European found new products during the crusades.
The answer D: The businessmen and merchants.