CNN  —  While the White House wages a trade war on behalf of US manufacturing, the largest and most important part of the American economy — one that has a trade surplus, not a gap — is under threat. The US trade gap, caused by American consumers and businesses importing more goods than they’re exporting, has gotten all the attention in the debate over tariffs But we sell far more services than we purchase from other countries. This means the US service sector enjoys a trade surplus with almost