[157]
To extend an olive branch to Latin American leaders embittered over America's interventionist policies in Central America and the Caribbean,[161] Coolidge led the U.S. delegation to the Sixth International Conference of American States, January 15–17, 1928, in Havana, Cuba, the only international trip Coolidge made during his presidency.[162] He would be the last sitting American president to visit Cuba until Barack Obama in 2016.[163]
For Canada, Coolidge authorized the St. Lawrence Seaway, a system of locks and canals that would provide large vessels passage between the Atlantic Ocean and the Great Lakes.[164][157]

Cabinet
Coolidge's cabinet in 1924, outside the White House.Front row, left to right: Harry Stewart New, John W. Weeks, Charles Evans Hughes, Coolidge, Andrew Mellon, Harlan F. Stone, Curtis D. Wilbur.Back row, left to right: James J. Davis, Henry C. Wallace, Herbert Hoover, Hubert Work.
Although a few of Harding's cabinet appointees were scandal-tarred, Coolidge initially retained all of them, out of an ardent conviction that as successor to a deceased elected president he was obligated to retain Harding's counselors and policies until the next election. He kept Harding's able speechwriter Judson T. Welliver; Stuart Crawford replaced Welliver in November 1925.