The open door policy impacts lasted for decades and they have three major impacts; increase Chinese backlash against foreigners. Chinese and American conflict with Japan. Increased US interest in East Asia
A reason why the Civil War lasted four years is that the Union had to fully conquer the South.
The Catholic church in Italy was controlled by the medieval popes, and the bishops were often worldly figures to nobles. The controversy of lay investiture was initiated by a decree from Pope Gregory VII in 1075, ended in an 1122 compromise called the Concordat of Worms. Pope Innocent III, in the 1200s, used tools such as spiritual to bring the church to the height of its political power.
B is correct.
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