When one political party controls the white house and another party controls the legislature, it is an example of government?

Divided government.

A divided government is a kind of administration in presidential systems when the power of the executive branch and the legislative branch is divided into two parties. Moreover, in semi-presidential arrangements, when the executive branch itself is divided between two parties.

Under the division of powers model, the state is separated into various branches. Each department is independent having separate powers and divisions of responsibility so that the authorities of one branch should not in dispute with the powers correlated with the other department.