Actually you are quite funny.....educate yourself and go look up the ethnicities of free colonists here at the time of the revolution. Mostly English, Dutch, French Huguenots and a few others.....and the leaders were almost exclusively English descended.
The Nordic immigrants came about 50-70 years later.
I know. Millions came to America in 19th century from third-world dictatorships - Ireland, Italy, Russia, Bohemia, etc. Today these are not all third-world. But in 19th century they were. People came for economic reason and became Americans. Why should today's third-world be different? Because they are not white?
And the Germans, especially in Pennsylvania but elsewhere as well. Even today, more Americans with European ancestry have some German ancestry. Much of that did come later, and it wasn't true during the colonial period, but there was a significant minority of Germans even then.
Of all those you listed, plus the Germans, only the English had much of history of republican government behind them. The rest adopted it after they came here, just as subsequent waves of immigrants have.