The best option would be that apart from military conquest, the reigns of Pacal the Great, Huayna Capac, and Moctezuma I all featured "<span>Large-scale public works projects," since these were deemed essential to the success of the state. </span>
It can be argued that US involvement in European politics could have prevented another world war. Support for the League of Nations could have stabilized the region. The US government did not support the League of Nations and without the US supporting it quickly crumbled. So because of American absence in the continent due to isolationist policy, it can be argued that World War 2 was destined to happen because of the unfair Treaty of Versailles
There are hardly any
It's mostly side effects such as mild fevers and stuff, but vaccines are a must
Hinduism, Buddhism I’m pretty sure that’s the top two