Question

how did alliances between nations serve to escalate world war i?
nations at war targeted neighboring nations of the enemy as an offensive strategy.
nations were forced to declare war against other nations because of pacts they had signed.
nations that shared a common culture were expected to fight on behalf of their neighbors.
nations that were on good terms with a nation at war were automatically considered enemies.

Explanation:

Before World War I, there were several alliances like the Triple Entente (Britain, France, Russia) and the Triple Alliance (Germany, Austria - Hungary, Italy). When Austria - Hungary declared war on Serbia (after the assassination of Archduke Franz Ferdinand), due to the alliance system:

• Russia, allied with Serbia, started to mobilize.
• Germany, allied with Austria - Hungary, saw Russia's mobilization as a threat and declared war on Russia.
• France, allied with Russia, then was drawn into the war as Germany (following the Schlieffen Plan) invaded Belgium (on the way to attack France).
• Britain, bound by treaties (like the Treaty of London which guaranteed Belgian neutrality) and its alliance with France (through diplomatic understandings), also entered the war. So, nations were forced to declare war based on the pacts (alliance treaties) they had signed.

The first option is incorrect because targeting neighboring nations as an offensive strategy is not the main role of alliances in escalating the war. The third option about common - culture - based fighting is not the key factor related to the alliance system. The fourth option is an over - simplification; it's the formal alliance pacts, not just being on good terms, that forced nations into war.

Answer:

Nations were forced to declare war against other nations because of pacts they had signed.