They built up their supply of arms and made agreements to support each other in the event of war.
Explanation:
One of the reasons why World War I was able to reach such an enormous scale was because many of these countries had made previous alliances, which meant that they had committed themselves to supporting each other in the event of a war. The war had seemed likely for a while, as German imperialism was on the rise and it threatened the borders of Europe. More importantly, it threatened the balance of power, an important concern for the continent. This lead them to build up their supply of arms.
On July 4, 1776, the Congress issued the Declaration of Independence, which for the first time asserted the colonies' intention to be fully independent of the mother country. The Congress established itself as the central governing authority under the Articles of Confederation, which remained in force until 1788.
