The invention of the microscope, contributed to the discovery and accelerated research of microscopic, single cell and multi-cell organisms that are found all around our planet, this also led to our better understanding of pathogens such as germs, viruses, bacteria, fungi, parasites, and much more. <span />
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The Missouri Compromise, "The Compromise of 1850", and "The Kansas-Nebraska Act" 1854
The Missouri Compromise was for maintaining a balance between "Free states and slave states" in the Union.Accordingly, Missouri was acknowledged as a "slave state", Maine was acknowledged as a free state, and slavery was not allowed in Louisiana Territory territory North of 36°30' but within the borders of the Missouristate.
The Compromise of 1850 was essential to ascertain if slavery would be permitted in states formed from the territory got from Mexico during the "Mexican-American War". California was acknowledged as a free state, while the "Territory of New Mexico" permitted slavery. The Compromise also comprised a measure forbidding the slave trade (however not slavery as such) within the Columbia District and a new and more powerful Fugitive Slave Law
The Kansas-Nebraska Act 1854 created the "territories of Nebraska and Kansas" and stipulated that people of these territories would elect to as certain if the 2 territories would permit slavery. This led to violence between "anti-slavery and" pro-slavery proponents who moved to these territories.
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true, British harasment of american ships on what was consider american waters by the US helped start the war of 1812.
President Frankliin D. Roosevelt had ran four terms back during wwll he also had polio which later led to his death so if you look up that president you will see when he ran for president and see how many terms he served
