All major continental empires proclaimed their desire to rule 'the entire world', investing considerable human and material resources in expanding their territory. Each, however, eventually had to stop expansion and come to terms with a shift to defensive strategy. This volume explores the factors that facilitated Eurasian empires' expansion and contraction: from ideology to ecology, economic and military considerations to changing composition of the imperial elites. Built around a common set of questions, a team of leading specialists systematically compare a broad set of Eurasian empires -...