Answer:
At his first press conference as president, Reagan audaciously questioned the ... the largest in American peacetime history, was undoubtedly another factor
the signing of the Treaty of Versailles
The Treaty of Versailles ending fighting between the Central Powers and the Triple Alliance (minus Russia).
The Treaty of Versailles set up a series of restrictions on the Central Powers following World War I. Germany was most restricted under the treaty due to the War Guilt clause. The Treaty also set up the League of Nations which would monitor and negotiate in the case of invasion in the future.
