The common trait was the intention to Christianize the Indians - that is to convert them to the Christian religion. The Spaniards were more brutal in this, often Christianizing by force, but the English also made strong attempts to convert the Indians.
Another common trait was the lack of interest in the local languages with the exception of priests or monks , who did it to be able to preach about Christianity to the natives.
Hm...
1) we would have to compete with them for food
2) we'd have to run like h if we saw a predator
3) we'd have much more different cities
4) some inventions might not have been invented
5) some modern species would be extinct, or not exist
Law of the Twelve Tables
Rome's laws that were written on 12 bronze tablets! Written down to protect people's rights so that everyone knew what the laws were.
"The best known ancient code is the Babylonian Code of Hammurabi. The Romans began keeping legal records, such as the Law of the Twelve Tables (451–450 bc), but there was no major codification of Roman law until the Code of Justinian (ad 529–565), which was compiled long after the dissolution of the Western Empire."