<u>The vacuum cleaner</u>
The firsts official vacuum cleaners were actually invented in England in 1901 by Hubert Cecil Booth. Though a great invention, his models were too big and not practical at all: they couldn't even enter buildings so it was used as a cleaning service or installed in the building itself.
After him, several other men made different versions of the vacuum cleaner: smaller, practical, portable, more efficient, with more accessories, etc. Until the American William Henry Hoover in early 1900s redesigned the vacuum cleaner: placed it in a steel box, designed attachments for the hose, added disposal filter bags and finally designed the first upright vacuum cleaner in 1926.
It wasn't until post-WW II, that the item could be afforded by American middle class and became common in households. Before it was a luxury. Later on, the appliance was widespread to the Western countries. Several variants of the vacuum have been made too.
The study of the emergence of civilizations examines the development of complex societies from previous simpler ones. But the question of how to define complexity is a tricky one that has affected archaeology from it’s beginning. How complexity is defined changes the framework of how societies are studied and viewed, often with problematic results. This is illustrated more dramatically with nineteenth century academics but still applies to archaeological study today.
One reason why the government need to protect enterprise is : A. give equal opportunity for business owners.
Without government protection, it would be easy for bigger enterprise to play dirty tricks on the smaller startup. If the government let this happen, this will stunt the growth of US economy because we 70 % of our income relied on small enterprise
hope this helpss