The romans improved on the greek phalanx by using:

One of the most effective and enduring military formations in ancient warfare was that of the Greek phalanx. The age of the phalanx

Explanation:

do good a u will succeed more importantly study thats wats improtant

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.