HHhhhhhhdjsjsjnwhshshebdbdbhdhdsbbddhbsbdhdbsbsbhshsbdhdhbdbdhdbsbdbbdhdbdbdbbdhdbdbsbshsbsnsjjdbsbsbdbsjbsbsbsbsbbsbdbdbdbsnsnsndbdnbsbxjsbsbsbnsnsnsbdbsbbshshdndndbndjsjskdndnjxhdbdbhdjsnskdhsbksnqvdhjehdnwbdjkebehdjwbdhdjwbksidbwjdkwhevhdjsbwnkdje
1790s. Philadelphia carpenters conduct first strike in the building trades in the United States. Philadelphia has first local union in the United States organized to conduct collective bargaining.
Answer:
The period saw major technological advances, including the adoption of gunpowder, the invention of vertical windmills, spectacles, mechanical clocks, and greatly improved water mills, building techniques (Gothic architecture, medieval castles), and agriculture in general (three-field crop rotation).
Explanation:
Answer:
The Battle of Britain was a military campaign of the Second World War, in which the Royal Air Force defended the United Kingdom against large-scale attacks by Nazi Germany's air force, the Luftwaffe. It has been described as the first major military campaign fought entirely by air forces.
