Question

what challenge did the united states pose to mexico after the revolution?
it blocked its border with mexico to keep immigrants out.
it imposed strict tariffs on a variety of mexican products.
it sent troops to mexico in an effort to seize its vast oil fields.
it launched military campaigns into mexico to protect us borders.

Explanation:

After the Mexican - American War and other events, the US launched military campaigns like the Pancho Villa Expedition into Mexico to protect its borders. This was a significant challenge for Mexico. The other options are not as accurate in the post - revolution context.

Answer:

D. It launched military campaigns into Mexico to protect US borders.