The stalemate continued for so long in World War I because of technological advancement, new types of warfare, new types of weapons, incompetent generals, and the similarity of strength of both sides. These reasons contributed to the long stalemate and long bloodshed between Central and Allied Powers.
The correct answer among all the other choices is 1. the assembly line. Henry Ford is famous for his use of the assembly line. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
The transcontinental railroad started on May 10 , 1869.
Popular sovereignty states that all authority to the government is from the people. So the answer is true.
