What is the horse people theory? Where do caucasians come from? Please explain while citing sources.
Closest definition I could find is The 'Horse-rider Theory'

The 'horse-rider theory' (kiba minzoku setsu) was proposed by the historian Egami Namio in 1948 CE to explain the cultural and political development of Japan in the 4th and 5th century CE. Namio suggested that 'horse-riders', or more accurately, members of a culture originally from North Asia and then present in mainland Asia and the Korean peninsula for whom the horse was especially important, had travelled to Japan and spread their ideas and culture. The resulting conquest of the indigenous tribes in Japan led to a more unified country and what would become known as the Yamato state. Namio pointed to the archaeological evidence of large numbers of horse trappings discovered within Japanese tombs of the later Kofun Period (c. 250-538 CE) and their absence in the earlier part of the period as support for his theory.

Retrieved from:
https://www.worldhistory.org/article/1105/the-horse-rider-theory-in-ancient-japan/

As for the 2nd question:

The Caucasian race was historically regarded as a biological taxon which, depending on which of the historical race classifications was being used, usually included ancient and modern populations from all or parts of Europe, Western Asia, Central Asia, South Asia, North Africa, and the Horn of Africa.[6][7]

First introduced in the 1780s by members of the Göttingen school of history,[b] the term denoted one of three purported major races of humankind (those three being Caucasoid, Mongoloid, and Negroid).[12] In biological anthropology, Caucasoid has been used as an umbrella term for phenotypically similar groups from these different regions, with a focus on skeletal anatomy, and especially cranial morphology, without regard to skin tone.[13] Ancient and modern Caucasoid populations were thus not exclusively white, but ranged in complexion from white-skinned to dark brown.[14]

as written on:
https://en.wikipedia.org/wiki/Caucasian_race
Hello