Why did so many immigrants come to the united states during the 19th century?

During the 1800s, people in several parts of the world determined to flee their houses and migrate to the United States. Decamping crop collapse, country, and job deficiencies raising contributions, and starvation, many developed to the U. S. because it was regarded as the state of commercial opportunity.  Starting from the 17th to 19th centuries,  African vassals proceeded to America against their preference.

a

explanation:

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.