No, it was a monarchy. The empire was tolerant of a wide variety of religions within its borders.
At times during the Roman empire the Germanic tribes within the empire's borders or outside of them, attacked Roman legions or guardposts. Some became part of the Roman military as auxiliaries. Some were trained by the Romans and then used that training against Rome. Finally at the end of the empire the Germanic tribes were some of many barbarians that settled within the old Roman borders. Rome was in the end unable to defeat Germanic tribes in war.
Attempting to organise security and prosperity within the empire.
Persia was attempting to include the Greek cities within its empire to stabilise its borders. The Greek citiy-states objected.
Pakistan is within the borders of the Persian empire though Persia was originally in Iran.
No religion "inspired" the Ottoman Empire. The Ottoman Empire had Sunni Islam as its State Religion, but it was not a view or tenet of Islam to create an Ottoman Empire.
Ever since the beginning of history, sage Emperors and wise rulers have bestowed on China a moral system and inculcated a code. Our Celestial Empire possesses all things in prolific abundance and lacks no product within its own borders. Moreover, our dynasty, swaying the myriad races of the globe, extends the same benevolence towards all.
The reign of Akbar is considered the golden age of the Mughal empire because Akbar expanded the empire and established "houses of wisdom" to educate the people and further knowledge within his borders.
The reasons for the fall of the Roman empire can loosely be divided into two parts -- corruption and lethargy from within and pressures on the borders from without.
The westward movement of peoples from Asia brought new peoples within the borders of the empire - Goths, Vandals and Huns, who overran it and took it over.
Indiana and within the waters of Lake Michigan it also borders Michigan.
An empire is typically larger in size and encompasses multiple kingdoms within its borders. Empires often have more diverse populations and territories, as well as a stronger centralized government, compared to kingdoms which are usually smaller and more homogenous in nature.