The document discusses the decline and fall of the Western Roman Empire between the 2nd and 5th centuries AD. It identifies several key factors that contributed to Rome's decline, including economic troubles, political instability, social changes, and military weaknesses. Constantine's conversion to Christianity and establishment of Constantinople helped the Eastern Empire thrive even as the West collapsed. Ultimately, the Western Empire disintegrated in 476 AD due to worsening internal problems and invasions by Germanic tribes like the Huns and Vandals.