Given the information you provided it looks like that's only true for the 1950s and 1960s, so it'd be much more accurate to say that Texans were the #1 exporter of migrants to California ~70ish years ago and those peoples' children and grandchildren--native Californians--grew up and ruined California.
They already California'd their Texas
Texas was the largest net exporter of migrants to California for decades: https://depts.washington.edu/moving1/California.shtml
What this means is that Texas-raised liberals all migrated to California and made it what it is now.
I know, facts are painful. For liberals. PS: for the brightest among us, which apparently is too many on this board:
2000-2010: alone: https://imgur.com/a/rixqglK
1950-2017: https://i.imgur.com/RDZJIjX.png
Given the information you provided it looks like that's only true for the 1950s and 1960s, so it'd be much more accurate to say that Texans were the #1 exporter of migrants to California ~70ish years ago and those peoples' children and grandchildren--native Californians--grew up and ruined California.