explain three Key Trade Facts listed:

1.U.S exports and imports have more than doubled as percentages of GDP since 1980.

2.A trade deficit occurs when imports exceed exports. the united state has trade deficit in goods.in 2018 U.S. imports of goods exceeded U.S. exports of goods by $891 billion.

3. Principle U.S. exports include Chemicals, agricultural products, consumer durables, aircraft, and computer software and services( think Microsoft and google)