I think it is the German policy of unrestricted submarine warfare. All the other ones are major factors.
Answer:
The Civil War in the United States began in 1861, after decades of simmering tensions between northern and southern states over slavery, states' rights and westward expansion. ... The War Between the States, as the Civil War was also known, ended in Confederate surrender in 1865.
Explanation:
The Missouri Compromise, by the terms of which slavery<span> was henceforth excluded from the territories north of latitude 36°30' (the southern boundary of Missouri), alarmed Thomas Jefferson, as he told John Holmes in this famous letter, “like a firebell in the night.” The vividness of the image was in keeping with the passions of the time. Despite being a slaveholder himself, Jefferson publicly disapproved of slavery. He even more strongly disapproved of any action on the part of Congress that, in his view, exceeded its constitutional authority. Slavery, Jefferson believed, would die a natural death if left alone; but the very life of the Union depended on maintaining a due measure in legislative acts. In addition, the Missouri Compromise had drawn a line across the country on the basis of a principle, not of geography; such a line, “held up,” as Jefferson put it, “to the angry passions of men,” could have no other ultimate effect than the disastrous rending of the body politic. Holmes, a Massachusetts man, was one of the few Northern congressmen to vote against the Tallmadge Amendment that would have excluded slavery from Missouri itself; Jefferson's prophetic letter to him was written April 22, 1820, just a month after the passage of the Missouri Compromise. </span>
Answer:
Ellis Island is an islet located in the waters of the Hudson River, near the port of New York, although it is part of the State of New Jersey.
During the late 1800s and 1950s, the island was the main port of arrival for immigrants arriving in the United States on transatlantic ships. There, these people were examined medically and their criminal history was checked, with which, if they did not pass these tests, they were deported back to their countries of origin.
Thus, Ellis Island became a clear example of the hardening of immigration policies in America, with which it went from an almost total admission of immigrants arriving in the country to the establishment of a series of admission criteria.
<span>On the morning of June 17, 1775, the British troops were surprised to see the Patriots in control of Breed's Hill. Immediately, they began to attack from the sea. Then, later in the day, General William Howe led his men in an assault on ground.</span>
