Answer:
the Constitution explicitly assigns the president the power to sign or veto legislation, command the armed forces, ask for the written opinion of their Cabinet, convene or adjourn Congress, grant reprieves and pardons, and receive ambassadors.
another Answer:
Congress shares with the president the power to make treaties and to appoint ambassadors. As for the president himself, he is assigned only two powers relating to foreign affairs: he is commander-in-chief of the armed forces, and he has the power to receive ambassadors.
The occasion was that they were on a ship heading to the new world and he held the speech explaining how the city will be led and how the state will flourish and they hadn't even reached it yet. He explained that the whole world will be looking towards them and that they will show how to live in the best possible way.