No, it is unethical to use another author's ideas without crediting his or her work or literature. Failing to credit an author's work in your own work is known as plagiarism. Plagiarism has serious and sometimes even legal consequences in both educational institutions and beyond that in the corporate world and publishing industries. To avoid plagiarism and remain ethical it is best to quote ideas given by another author and clearly state the source from which you are quoting the author's work.
Most of us believe that there is heaven and hell but we don't really know if it is true. Most religions say if you are a good person on earth then you go to Heaven but if you are bad like you murder people then you go to hell. These days i think most people go to hell because everyone want money and don't care if they are ruining peoples lives.
Hope I helped!
:D
The answer is build railroads cause that is all that they used for transportation late 1800s
