Containment was the strategy America used to

Prevent the spread of communism

Explanation:

After the second world war there was the itching for the then Sorviet Union to pervade the spread of communism into other continent. It was a foreign policy developed by the US containment to prevent this from happening. Communism has its idealogy in common ownership and state devoid of social status.

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

geography

this is because warmer climates often don't get people sick from the flu and regions where it was often colder more people received the flu. hope this if you need more reasoning i am here to