Scientific and navigational advancements that made exploration possible include: better maps
(cartography), rudder, caravel, triangular sails, compass, and

:) hope it helps

A more troubling pattern was also emerging in national politics and culture. During the first decades of the nineteenth century, American politics was shifting toward “sectional” conflict among the states of the North, South, and West.Since the ratification of the Constitution in 1789, the state of Virginia had wielded more influence on the federal government than any other state. Five of the first six presidents, for example, were from Virginia. Immigration caused by the market revolution, however, caused the country’s population to grow fastest in northern states like New York. Northern political leaders were becoming wary of what they perceived to be a disproportionate influence in federal politics by Virginia and other southern states.Furthermore, many northerners feared that the southern states’ common interest in protecting slavery was creating a congressional voting bloc that would be difficult for “free states” to overcome. The North and South began to clash over federal policy as northern states gradually ended slavery but southern states came to depend even more on slave labor.The most important instance of these rising tensions erupted in the Missouri Crisis. When white settlers in Missouri, a new territory carved out of the Louisiana Purchase, applied for statehood in 1819, the balance of political power between northern and southern states became the focus of public debate. Missouri already had more than 10,000 slaves and was poised to join the southern slave states in Congress.Accordingly, Congressman James Tallmadge of New York proposed an amendment to Missouri’s application for statehood. Tallmadge claimed that the institution of slavery mocked the Declaration of Independence and the liberty it promised to “all men.” He proposed that Congress should admit Missouri as a state only if bringing more slaves to Missouri were prohibited and children born to the slaves there were freed at age twenty-five.