Answer:
because they had everything they need
The goal of the writers of the Lecompton Constitution is humanitarian aid to slaves. It was proposed for the state of Kansas in response to the anti-slavery position of the 1855 Topeka constitution and other free state advocates. The constitution protected the slave holder rights, enshrined slavery and allowed voters the choice of allowing more slaves to enter the territory.
The first recorded gladiatorial combat in Rome occurred when three pairs of fights fought to the death, which is why its represented in Rome.