What two purposes did the st. lawrence river serve?

The river was very useful for the European conquerors in the beginning of the expedition, and it was also crucial for the invasion of New France by England in the war of 100 years.

Sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532. i found this information on wikipedia