Why Did the Roman Empire Stop Expanding?

Why, at the height of its power, did the Roman Empire stop growing? The cold northern climate and fierce Germanic tribes were only part of the answer...

My discussion with Adrian Goldsworthy: Rome and Persia: 700 years of rivalry...

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Chapters:
0:00 Introduction
1:16 From the Republic to Augustus
2:25 The problem of stability
3:38 Defining the frontier
4:24 Ecological boundaries
4:56 Mountains and climates
6:01 Demographic boundaries
6:54 The eastern frontier
7:35 A conversation with Adrian Goldsworthy