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; A full season of operas is performed in the downtown Theatre District by Houston Grand Opera while a smaller community-based opera company (Opera in the Heights) performs in Lambert Hall Operas are also performed each spring and fall at both the Shepherd School of Music and the Moores School of Music Houston Grand Opera performs at least one free show each summer at the Miller Outdoor Theatre. There were 943,183 housing units in 2017 and 838,950 households. 43.3% of Houstonians owned housing units with an average of 2.66 persons per household the median monthly owner costs with a mortgage were $1,533 and $511 without a mortgage Houston's median gross rent from 2013-2017 was $940 the median household income in 2017 was $49,399 and 21.2% of Houstonians lived below the poverty line. ; Autumn Land warfare changed from the static front lines of trench warfare of World War I which had relied on improved artillery that outmatched the speed of both infantry and cavalry to increased mobility and combined arms the tank which had been used predominantly for infantry support in the First World War had evolved into the primary weapon in the late 1930s tank design was considerably more advanced than it had been during World War I and advances continued throughout the war with increases in speed armour and firepower.[citation needed] At the start of the war most commanders thought enemy tanks should be met by tanks with superior specifications. This idea was challenged by the poor performance of the relatively light early tank guns against armour and German doctrine of avoiding tank-versus-tank combat This along with Germany's use of combined arms were among the key elements of their highly successful blitzkrieg tactics across Poland and France. Many means of destroying tanks including indirect artillery anti-tank guns (both towed and self-propelled) mines short-ranged infantry antitank weapons and other tanks were used. Even with large-scale mechanisation infantry remained the backbone of all forces and throughout the war most infantry were equipped similarly to World War I the portable machine gun spread a notable example being the German MG34 and various submachine guns which were suited to close combat in urban and jungle settings the assault rifle a late war development incorporating many features of the rifle and submachine gun became the standard postwar infantry weapon for most armed forces, According to U.S News and World Report many hospitals in Houston consistently rank among the nation's top healthcare institutions. Harris County ESD #7 Fire Spring VFD 1% .06545 Manufacturing and industry In 1939 the United States had renounced its trade treaty with Japan and beginning with an aviation gasoline ban in July 1940 Japan became subject to increasing economic pressure. During this time Japan launched its first attack against Changsha a strategically important Chinese city but was repulsed by late September. Despite several offensives by both sides the war between China and Japan was stalemated by 1940 to increase pressure on China by blocking supply routes and to better position Japanese forces in the event of a war with the Western powers Japan invaded and occupied northern Indochina. Afterwards the United States embargoed iron steel and mechanical parts against Japan, European conquistadors in the Americas made extensive use of crossbows with firearms becoming widespread only from the 1570s a scarcity of firearms did not prevent conquistadors to pioneer the use mounted arquebusiers an early form of dragoon in the 1540s Francisco de Carvajal's use of firearms in the Spanish civil war in Peru prefigured the volley fire technique that developed in Europe many decades after.
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