Which of the following best explains why the destructive scale of European warfare increased in the twentieth century? А
European states could now draw on colonial empires for resources.
B
European states began to implement mass mobilization of conscript armies.
C European states deployed new weapons and manufacturing technologies.
D
European states were influenced by Marxist and communist ideologies.

the mexican-american war was a conflict between the united states and mexico, fought from april 1846 to february 1848.

i believe the answer would be 1.

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.