Explain the quote "American blood shed on American soil.”

Douglas thought that since the climate in Kansas and Nebraska is awful for cotton plantations, he thought that the non slave states would be okay with it being passed

Explanation:

After two of Polk's cabinet members said it would be better if Mexican troops fired first, on the same evening on April 25th Mexican troops crossed the Rio Grande and attacked Taylor's command with sixteen of his troops killed or injured. In response, Polk at once sent a war message to Congress declaring that was had been force upon them by the shedding of "American Blood on American Soil" even though the Mexicans had good reason to regard it as their own. Even though Congress overwhelmingly voted for war, one Whig congressman, Abraham Lincoln introduced a resolution requesting information as to the precise spot on American soil that American blood had been shed./ Polk was motivated by British wanting to buy California. J

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.