Whose campaign pledge stated he would "safeguard" america first? eugene debs al smith herbert hoover theodore roosevelt warren g. harding?

The correct answer is Warren G. Harding. This was the slogan of him and Calvine Coolidge, his vice president. This was the period after world war 1 and he believed that US should not behave like Wilson wanted and should protect itself and look for its best interests instead of meddling in European affairs.