4. As a common man.
Andrew Jackson was more down-to-earth, and one thing people were afraid of was how emotional he could be. Which had its pros and cons, and a pro was that it made him seem like more of a common man. When he was elected, he let common people roam the White House because they were common, like him.
They developed new products and inventions. And I think they started a number of new business
The correct answer is Mutually assured destruction.
This term was used throughout the Cold War era. Mutually assured destruction means that if nuclear warfare were to ever occur, both countries would be completely destroyed due to the amount of military technology each country had. The US and Soviet Union came close to this type of destruction multiple times during the Cold War, but were able to negotiate deals before it ever actually happened.
The main idea is that many Mexicans are still displaced. There are tensions and even the slightest "fight" can cause major problems.
The answer would be both developed vaccinations against diseases.