Assertion: empire's expansion | /r/HasProperty | slow
Facets:
Source sentences:
text: Expansion into the vast stretches of Siberia was slow and expensive, but finally became possible with the building of the Trans-Siberian Railway, 1890 to 1904.
text: Inca expansion was slow until about the middle of the fifteenth century, when the pace of conquest began to accelerate, particularly under the rule of the emperor Pachacuti.