Why was economic expansion during the chinese tang and song dynasties linked to military expansion?
a. military expansion into vietnam introduced the chinese to faster-growing rice, which made it possible to rice crops a year in southern china
b. military expansion into manchuria and korea made it possible for the chinese to harness new energy sources in the water buffalo and the ox
c. military expansion into korea and japan introduced a new strain of drought-resistant wheat into northern china
d. military expansion into vietnam introduced terraced farming to china, which greatly increased the amount of land under cultivation in mountainous southern china

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.

it broke up the ottoman empire (just a small fact) and the turkish leaders lost many soldiers.