(17.4.) The spring meetings of the International Monetary Fund and World Bank have filled Washington with motorcades and traffic jams and loaded the schedules of President Obama and Treasury Secretary Jacob J. Lew. But they have also highlighted what some in Washington and around the world see as a United States government so bitterly divided that it is on the verge of ceding the global economic stage it built at the end of World War II and has largely directed ever since…