What is the real name oh polka? explain throughly?

Why was the monroe doctrine necessary?

What stalled germany's initial invasion into france in 1914

Which of these is not a criticism of the concentric zone model? it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.