How did roman govermebt meintain control over conqeredb territories?

discovery of cape town-portuguese empire

development of africans language-dutch east india company

introduction of railway-british empire

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers