Explain one similarity in the role of serfs and vassals in the feudal system between 600 and 1450?

One similarity is that they both owed service to another person of high status. Serfs owed service to lords because they provided them protection and land. Vassals owed service to kings because they provided them land.

Explanation:

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.

fwe43 uigfegiufiuwggiufwiugfew fgewugfewugguefw guifewgiufewgi answer 1935