The facts of evolution come from observational evidence of current processes, from imperfections in organisms recording historical common descent, and from transitions in the fossil record. Theories of evolution provide a provisional explanation for these facts. See: NATIONAL GEOGRAPHICS

An alliance is a pact, coalition or friendship between two or more parties, made in order to advance common goals and to secure common interests.

Training is an environmental socialization/behavioral trait; the process by which animals become accustomed to human presence.
(not Domestication)

An empire is a geographically extensive group of states and peoples (ethnic groups) united and ruled either by a monarch (emperor, empress) or an oligarchy.

Horsepower is a term was adopted in the late 18th century by Scottish engineer James Watt to compare the output of steam engines with the power of draft horses. See: CLYDESDALES
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