Colonies such as Massachusetts, Pennsylvania and Maryland were settled primarily by people seeking religious freedom. Pilgrim Separatists desired a break from the Church of England, and arrived in Massachusetts aboard the Mayflower in 1620. Later, a different religious sect, the Puritans, arrived in Massachusetts fleeing persecution in England. Unlike the Separatists, the Puritans did not want to break from the Church of England; they wanted to "purify" it. This was met with opposition -- including violence -- and by 1630 nearly 20,000 Puritans fled to Massachusetts. Colonies such as Maryland were founded as a refuge for other persecuted religious groups. English persecution -- like a ban on a Catholic priest officiating a marriage of two Catholics -- prompted many to come to Maryland. Lord Baltimore founded Maryland as a Catholic refuge in 1632.
Because they wanted to separate from England and wanted to become an independent nation.
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In 1850, Congress faced a confrontation between slave and free states, which was solved with the Compromise of 1850.
The Compromise of 1850 was a set of five bills passed by the Congress of the United States in September 1850, which appeased a political confrontation between slave states and free states. This crisis, which lasted five years, had its origin in the disagreement on the status that territories acquired after the Mexican-American War should receive, and reached its maximum degree of tension with the problem of fugitive slaves in those years.
The compromise was drafted by Whig Senator Henry Clay of Kentucky and negotiated by Clay himself and Democratic Senator Stephen Douglas of Illinois. The controversy that deeply aggravated the crisis arose from the attitude that the northern states had towards the fugitive slaves, since there was an increasing disposition on the part of the northerners to avoid the Fugitive Slave Law of 1793 (this law obliged those slaves who escaped from the southern states to be returned to their owners). The response to the pressures of the southerners ended in unfair captures of free African Americans who were dragged to the southern states to be subjected to slavery. This controversy led to a whole confrontation that endangered the Union when it also had to define the status that the new territories should assume after the war against Mexico with respect to slavery.
In short, of the three new territories annexed by the United States, California became a free state while Utah and New Mexico became slave territories.
Germany invaded neutral Belgium--Great Britain viewed an attack on a neutral country an act of aggression.
Germany invaded Belgium as a quick means to invade France. Belgium should have been avoided being a neutral country but Germany took the risk so they could attack France quickly and then turn to fighting Russia. Great Britain being in an alliance with France and Russia, fought on their side in the war.