In which year was first environmental day celebrated

1974

Explanation:

1974. World Environment Day is celebrated for the first time with the slogan “Only One Earth.”

the president has the power to appoint federal judges, ambassadors, and other "principal officers” of the united states, subject to senate confirmation of such appointments.

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.