noun which may take the genitive case particle 'no'
toward the US; with the US; US-related
Used as a prefix-like modifier in compounds and noun phrases to indicate direction, relation, or policy toward the United States. Common in news, diplomacy, and economic contexts.
対米貿易赤字が拡大している。
The trade deficit with the US is widening.
政府は新たな対米政策を発表した。
The government announced a new policy toward the US.
対米 concerns the United States specifically, whereas 対中 concerns China, though both follow the same 対〜 prefix pattern that can confuse learners.
trade with the United States; US trade
exports to the United States
relations with the United States; US relations
Compound of 対 (たい, 'toward, versus') and 米 (べい, abbreviation for 米国 'America'). The use of 米 for America comes from the second character of 亜米利加 (アメリカ), an old ateji spelling.