Why is understanding the differences between types of sources important to understanding history?

Me asap with these two questions about wwi 20 points will be rewarded.1. what is the significance of the battle of somme? 2. how many years into the war did it take for germany to use poison gas on a large-scale?

Lucifer with lucifer, although an angel he and not a man, i purpose to begin. for notwithstanding angels cannot be the sport of fortune, yet he fell though sin down into hell, and he is yet therein, o lucifer, brightest of angels all. now thou art satan, and canst never win out of my miseries; how great they fall! adam consider adam, made by god's own fingerm and not begotten of man's unclean seed, he that in eden was allowed to linger - now call damascus- and had power at need over all paradise, save that decreed and single tree prohibited. than he none ever on earth stood higher, till his deed drove him to labour, hell and misery describe a theme that the author develops through these two excerpts. then analyze how the two excerpts interact and build on one another to develop this theme. be sure to use specific details from the text to support your ideas

Why did the us government remove native americans from the southeast in the 1830s