New scientific knowledge help the building of the Panama canal because there was a decrease of workers getting sick of malaria and yellow fever. It was Colonel Gorgas, the Chief Medical Officer, who have read about discoveries linking mosquitoes and malaria. Due to these readings, he succeed in eradicating the cause of the disease therefore a decrease in people getting sick.
They end slavery because of amendments
Sojourner Truth--Sojourner Truth was born a slave and eventually ran away to freedom after New York abolitionist slavery.
Sojourner Truth joined the abolitionist movement advocating for the end to slavery but also spoke for women's rights. "Ain't I a Woman" is her most famous speech delivered in Ohio at a women's rights convention.
You answer would Constantinople. The Muslims had cannons yo take down the city's walls.
They brought horses. It was easier for them to catch up with the buffalo and hunt instead of having to throw weapons from a far and run after the Buffalo.
