China did not purchase any of the extra $200 billion in U.S. exports pledged under a bilateral trade deal signed in 2020, an analysis by a U.S. research institute showed Tuesday, highlighting the failure of the agreement that was touted as “historic” by then U.S. President Donald Trump. Under the so-called phase one trade deal, China agreed to increase purchases of certain U.S. goods and services by at least $200 billion in 2020 and 2021 compared with 2017 levels, meaning the world’s second-largest economy would buy a total of $502.4 billion over the two years. But actual U.S. exports of the g…