Answer:
all of them are correct kkkkkkk
The main objection studied in political schools:
Globalization causes new global problems which lead to a situation where actions in one country affect another country, or even the rest of the world (as an example - the 2008 economical crisis). Globalization comes with an interdependence of the problems that happen around the world and requires greater collaboration between countries.
Manifest Destiny basically mean, "EVERYONE MOVE TO THE WEST NOW!" But with no slaves, how would they create farms to maintain themselves? Easy: expand slavery. However, this was battled against by several sources to create the Compromise of 1850. The compromise delayed the Civil War, despite politicians knowing it will eventually happen. It bought them time-- that was important! Other new states like Nebraska and Kansas were allowed to allow slavery or not. This eventually grew to where the North had no slavery and the South did, which lead to the Civil War.
The correct answer among all the other choices is Steam locomotive. This is the transportation development that had the greatest long-term impact on the American economy. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.