(United States of) America; USA
「米」 has other readings with different meanings.
(husked grains of) rice
88 years old
(United States of) America; United States; US; USA
米国の大学に留学したいです。
I want to study in America.
日米関係はとても複雑ですね。
Japan-US relations are complex.
米軍基地が近くにあります。
There's a US military base nearby.