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Entangling alliances grew the small conflicts instantly.
When Austria-Hungary attacked Serbia for just the region of Bosnia-Herzegovina, automatically Russia and Germany were in the war.
The executive branch had very little power under the Articles of Confederation. The legislative branch was by far the strongest under this system and this left the federal government very weak and invited anarchy among the states and general population.
<em><u>Lack of sanitation,</u></em><em> </em><em><u>ineffective treatments</u></em>, and <em><u>increase of rats and fleas</u></em> are the contributors. The other three are the effects.