<span>Nationalism became popular after the French Revolution because many nations thought each nationality should have its own government. It promoted the idea that the people owned the state and the people had an important stake in the state.
</span>
<span>In Old Renaissance Europe, he was known for being the original inventor of algebra, though it's known that his work is based on older Indian or Greek sources.</span>
A.) Hope this helped. Let me know if it was correct.. (90% sure)