The bermuda triangle is something that sucks in everything around it. it's not a conspiracy theory, fake snow is.
"<span>Indentured servants were less likely to travel to the Americas" would be the best option from the list, since this greatly increased the demand for slaves who were forced to do the left-over work.</span>
The Underground Railroad was the name of the escape routes used by slaves to escape the South and flee to the North. It was a network of special routes and safe houses that were used by both slaves and abolitionists who were sympathetic to their cause of escaping slavery. It started in the late 1700's and ended after the abolition of slavery. Canada was a popular destination, as slavery was prohibited their and had a longer border for easier access.
The Mughal's adoption and usage of weapons that use gunpower.