One piece of evidence would be his stance in the French revolution. Dropping a statement of neutrality in the war, rather than holding up on his side of the treaty, and helping his French allies fight against Great Britain.
Another, possibly more important piece of evidence would be in regard to Washington's Farewell Address of 1796; stating we, as a country, should not - "entangle our peace and prosperity," and to "steer clear of permanent alliances."
