In the 1950s, imports and exports of goods and services constituted roughly 4% to 5% of u. s. gdp. in recent years, exports have accounted for approximately 12% of gdp, while imports have more than tripled to over 15% of gdp. which of the following to explain the increase in international trade and finance since the 1950s? check all that apply. better high-speed rail lines international trade agreements such as the north american free trade agreement (nafta) increases in the global population improvements in telecommunications