England ceased being the largest source of immigrants to the New World around 1680. Why did large numbers of immigrants from Continental Europe start coming to the New World at this time? I need help please?

Why was it decided in potsdam that certain industries in germany would be disabled? a. to deplete resources that might prevent germany from coming to power again b. so that a portion of the eastern region of poland would be fused together with the soviet union c. to allow the allies to focus their war efforts in fighting the last part of the war against japan d. to provide economic aid for iran's government since large war demands were made on them