Final answer:
The question regarding the Texas Act Concerning Free Persons of Color in 1840 does not have a direct reference in the provided material. The information discusses post-Civil War struggles for Black Americans in Texas, legal efforts to establish citizenship rights, and the persistent racial challenges during the Reconstruction era.
Step-by-step explanation:
The Texas Act Concerning Free Persons of Color in 1840 cannot be specifically referenced to from the supplied information, as the details provided predominantly discuss the broader context of African American life and legislation from different periods. The information alludes to the challenges faced by Black Americans following the abolition of slavery, including seeking refuge in freedom colonies, the vulnerability to violence and institutional racism, and the difficulty in acquiring land. The Fourteenth Amendment and the Civil Rights Act of 1866 are referenced, highlighting the struggle for equal rights and citizenship which followed the Civil War period. Additionally, the consequences of the Fugitive Slave Act of 1850 and factors contributing to racial violence in Texas during the Reconstruction era are mentioned.