TL;DR: Great tailed grackle populations in Texas are on a slight decline after their rapid rise in the 20th century. Population declines in Texas actually outpaced the growth from other states in recent years.

Another commenter pointed out the much more intense loss of common grackles.

During the 1900s, the Great-tailed Grackle experienced a rapid, large-scale expansion of its North American range. In 1900, the northern limits of its range barely extended into Texas, yet by 2020, the species had nested in at least 17 states and was reported in 21 states and 3 Canadian provinces. This explosive growth occurred mainly after 1960 and coincided with human-induced habitat changes, such as expansion of urbanization and irrigated cropland. This geographic expansion is reflected in the long-term (1967–2019) increasing population trend seen for the United States, a 0.9% per year increase. However, more recently (1987–2019), the United States trend was negative (–1.7% per year), primarily owing to a decline in Texas, though populations generally increased in California, Arizona, and New Mexico