Today the address is primarily remembered for its words concerning non-involvement in European wars and politics. For much of the 19th century, the expanse of the Atlantic and Pacific Oceans had made it possible for the U.S. to enjoy a kind of "free security" and remain largely detached from Old World conflicts, and social conventions made international travel by incumbent politicians taboo. The restriction began to erode and break down in the early 20th century, as policy makers at the federal level began to reevaluate the nation's role in international affairs. The first international presidential trip was made in 1906 by Theodore Roosevelt, and subsequently, during World War I, Woodrow Wilson made a case for U.S. intervention in the conflict and a U.S. interest in maintaining a peaceful world order. Since then, the U.S. has signed numerous treaties of alliance with foreign nations.