Why did the united states provide an advantage against the stalemate?

During this period of neutrality, the United States rapidly found itself embroiled in the escalating force that transformed the European war into the world struggle. With European armies locked in the standstill along the Western side, in 1915 both Britain and Germany attempted to gain this benefit by utilizing their navies to break the exchange of their enemy. The country instituted the naval blockade that included mining the North ocean, while Germany worked to its first arm, the U-boat ( bomber), to begin change attacks against the merchant and military vessels approaching Great Britain.

following type of cultural development caused people to want and buy new products on the market :

the idealization of the rural landscape ; admiration for the beauty of nature ; focus on an individual's inner concerns