As I recall it was rolled-steel girders riveted together, probably from shipbuilding, together with steam-powered winches and an abundance of cheap steel. As opposed to European cathedrals erected with animal-powered winches and with more expensive forged iron bracing (one of the big cathedrals has a kind or iron corset to keep the walls from bursting outwards).
The United States first began developing nuclear weapons in 1939, during World War II, under the order of President Franklin Roosevelt. Motivation was the fear that US was engaged in a race with Nazi Germany to develop nuclear weapon. This project is best known as Manhattan Project.
Answer:
The creation of labor unions was to fight the injustice of unions such as low pay, long hours, and poor work conditions. Many Americans at the time felt that these were necessary steps to fight the unfairness or to end it completely.
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It was much lighter and easier to carry unlike the coins they normally used.
Answer:
1.) In China, the demand for silver initially drove the global economy. ... The devaluation of silver in China had a devastating financial effect on Spain as well — a fact that allowed its European competitors to gain the upper hand in a new global trade focused on sugar, tobacco, gold, and slaves."
1)- slave trade, Spanish forced Africans to mine silver
2)- Atlantic ocean became crucial, triangular trade with Americas, Africa, great Britain, and Spain
3)- traditional regional markets in afro-Eurasia, products increased and shipping improved
