It would be combat service in the army, according to the source from Native American source.net, some 10,000 Native American tribe members served in the military in WW1.
Answer:
The answer is be D, disagreement over the Mexican-Texan border.
Explanation:
Mexicans had shot Americans on what they thought was Mexico's side of the border, but the Americans thought the Mexicans had shot them on United States side of the border.
Answer:
they made transportation faster
Explanation: