What made the Westward Expansion so easy?

There were a number of factors that seemed to converge to make westward expansion more feasible. This included political acts like the Louisiana Purchase and the notion of "manifest destiny."  Increased economic activity like fur trading helped to forge routes westward like the Oregon Trail.

Explanation:

Westward expansion describes the movement of settlers in the American West beginning in the 19th-century. This began when President Thomas Jefferson purchased territory from the French government that doubled the size of the United States in 1803.  Western expansion was also aided by the Gold Rush and the Oregon Trail.  Initially, the Oregon Trail was a route that fur trappers had staked beginning about 1811. They continued to use the route for trading and moving their products until the 1840s. At that time the trail was on passable by foot or by horse. It wasn't until 1836 that the first wagon train left Independence Missouri and was able to get as far as Idaho.  People liked the idea of settling in new communities and finding new opportunities out west and this was reinforced with manifest destiny, the notion that Americans should progressively develop the country and generate prosperity. Unfortunately, this displaced a lot of indigenous groups in the process.  

the best and most correct answer among the choices provided by the question is the second choice "less supportive to the war of 1812"

the war of 1812 was a military conflict that lasted from june 1812 to february 1815, fought between the united states of america and the united kingdom, its north american colonies, and its native american allies.

i hope my answer has come to your . god bless and have a nice day ahead!