According to Brinley Thomas, the Inflows of Immigrants to the U.S

According to Brinley Thomas, the inflows of immigrants to the U.S. in the late-19^th and early 20^th centuries

A) caused simultaneous growth surges in the U.S. and Europe.
B) caused growth surges in the U.S. to coincide with slowed growth in Europe.
C) hampered the growth of both the U.S. and Europe.
D) had no systematic impact on growth patterns in the U.S. or Europe.