(A) militarism
(B) ** alliances
(C) imperialism
(D) nationalism
EXPLANATIONS BELOW
Concept note-1: -Alliances are formal agreements between two or more nations. In national defense, they’re promises that each nation will support the other, particularly during war.
Concept note-2: -allies. an alliance of nations joining together to fight a common enemy. axis, bloc. a group of countries in special alliance. Allies.
Concept note-3: -an agreement to work with someone else to try to achieve the same thing: The three smaller parties have forged/formed an alliance against the government.
Concept note-4: -The Triple Alliance was an agreement between the countries of Germany, Austria-Hungary and Italy and the Triple Entente was an agreement between the countries of England, France, and Russia.