The development of an atomic bomb by the soviets in 1949 did all of the following led to the authorization of the development of a hydrogen bomb in the u. s. pave the way for a nuclear arms race between the u. s. and soviet union. increased psychological tensions in the u. s. and soviet union. led to a treaty that limited the number of nuclear weapons in the u. s. and soviet union.

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explanation:

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"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

a king decides to declare war on a neighboring country without the input of any advisers

the geography of greece

led to limited interactions with other cultures in the mediterranean

was rich in natural resources and led to repeated invasions from the macedonians

encouraged greater contact with peoples on the southern and eastern mediterranean coasts

caused the greeks to eventually relocate eastward under alexander the great