How is today's world politically organized and why? how can this type of political organization lead to conflict (over issues such as boundaries, ethnic diversity, how do forces such as ethno-nationalism, devolution, supranationalism and/or the rise of extremist non-state actors (such as international terrorist groups) increasingly challenge this system

D. continental rift

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Its led to migrationits led to death 

It would be tomatoes i believe