Answer:
Khalifa Umar ibn Al-Khattab created the Hijiri calendar.
The correct answer is <span>b methodically purging potential rivals
In these purges millions of people died. Many of them would just disappear over night while other would be sent to Siberia into Gulags or to work until they die in mines and similar projects. He would even remove them from history by removing them from pictures and destroying everything they ever had or wrote or built.</span>
Correct answer choice is :
<h2>B) In large cities </h2><h2 /><h2>Explanation:</h2><h2 />
The United States encountered significant waves of immigration during the colonial era, the first part of the 19th century and from the 1880s to 1920. Many emigrants came to America endeavoring greater economic chance, while some, such as the Pilgrims in the early 1600s, appeared in search of spiritual liberty.
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