During the same period, New England and areas settled by New Englanders (upstate New York, Ohio's Western Reserve, and the upper midwestern states of Michigan and Wisconsin) were the center of the strongest abolitionist and anti-slavery movements in the United States, coinciding with the Protestant Great Awakening in the region. Abolitionists who demanded immediate emancipation such as William Lloyd Garrison, John Greenleaf Whittier and Wendell Phillips had their base in the region. So too did anti-slavery politicians who wanted to limit the growth of slavery, such as John Quincy Adams, Charles Sumner, and John P. Hale. When the anti-slavery Republican Party was formed in the 1850s, all of New England, including areas that had previously been strongholds for both the Whig and the Democratic Parties, became strongly Republican. New England remained solidly Republican until Catholics began to mobilize behind the Democrats, especially in 1928, and up until the Republican party realigned its politics in a shift known as the Southern strategy. This led to the end of "Yankee Republicanism" and began New England's relatively swift transition into a consistently Democratic stronghold.