The Ottoman Empire. When one European power annexed a part of its crumbling power, it caused concern that they might get it all. The other European powers wanted a chance at picking it apart too.
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The "Red Shirts" are mostly associated with the period that followed after the Reconstruction era of the United States of America. Although they were present from the year 1875 but they became most active after the Reconstruction era. So it can be said that during the late 19th century the "Red Shirts" were most active.