Question

How are Mexico and the United States similar nations?

Check all that apply.

They both share identical cultures on the interior of each country.

They both have similar military might and culture.

They both work together as economic partners.

They both share cultures, especially along the border.

Answer 1

I would say A and C because those are the best compared to the others. 

Answer 2

Well, D is definitely correct - they both share cultures, especially along the border, because they used to be one country in the past.
I'm not sure about the second answer though, perhaps C (They both work together as economic partners.) is correct because they do trade a lot.