Literally the opposite because they made domestic manufacturing more expensive because the tariffs were on steel and aluminum and other raw materials. Domestic manufacturing becomes more expensive.

Tariffs are taxes on business, paid to the government by American businesses; business does not give away free money, they charge customers more. Tariffs become taxes on goods for everyday people. Every American lost in trump's idiotic trade war. China's market went from 8.8 billion people to 8.6 billion people, china didn't suffer.