Which is a characteristic of a federal state?

D. governmental power is shared

Explanation: In a Federal state, the power within the government typically shifted into several smaller regions. Each region will be given the power to independently regulate Itself (creating legislation, proposing government programs, etc), In United States, we refer to this as States government.

On top of the state's government, the Federal state established the Central government. The central government has authority over the state's government and will be responsible to create regulations that affected a nation as a whole rather than one individual state.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.