> The Roman Empire lost the strengths that had allowed it to exercise effective control over its Western provinces; modern historians posit factors including the effectiveness and numbers of the army (check), the health and numbers of the Roman population (check), the strength of the economy (check), the competence of the emperors (check), the internal struggles for power (check), the religious changes of the period (check), and the efficiency of the civil administration (check). Increasing pressure from invading peoples outside Roman culture (check) also contributed greatly to the collapse. Climatic changes (check) and both endemic and epidemic diseases (check) drove many of these immediate factors.