Many scholars argue that there is more than one type of nationalism. Nationalism may manifest itself as part of official state ideology or as a popular non-state movement and may be expressed along civic, ethnic, cultural, language, religious or ideological lines. These self-definitions of the nation are used to classify types of nationalism. However, such categories are not mutually exclusive and many nationalist movements combine some or all of these elements to varying degrees. Nationalist movements can also be classified by other criteria, such as scale and location.
C) Texas sought to gain independence from Mexico, due to Mexico's government changing from a democracy to a dictatorship.
Texas saw the laws in Mexico as arbitrary and tyrannic in many ways. It reminded them of how British used to treat the colonies, maybe worse. They did not want to follow the rules of Mexico.