Thousands indefinitely but not many
Answer:
Militarism was a cause of World War One because increased military rivalry led not only to the belief that war was coming and when Britain made the HMS Dreadnought in 1906, Germany made a similar battle ship, increasing tension and nerves.
Explanation:
Islam spread through military conquest, trade, pilgrimage, and missionaries.
Arab Muslim forces conquered vast territories and built imperial structures over time.