Question

A type of infrastructure that state governments maintain is schools. roads. libraries. parks.

Answer 1

A type of infrastructure that state governments maintain is "roads."

Building and keeping up roads and bridges is generally the duty of state and local governments. Of the 4.1 million miles of road in the U.S., very nearly 97 percent are under the purview of state and local governments. Just 146,000 miles are under the ward of government offices, incorporating streets in national woods and parks and on military and Indian reservations.  

Since the mid twentieth century, in any case, the government has shared the expense of upgrades deeply parkways and spans that are most basic to the quality and execution of the country's economy.

Answer 2

Roads

(ingnore this extra stuff i just need to get it to twenty words so idk man hows your day going)