The article explores how the European Union's expansion affected regional growth and convergence. It shows that neighboring regions' growth rates influence each other, leading to spatial convergence clubs. The study confirms that spatial effects like autocorrelation and heterogeneity are still important in understanding economic development in different regions. The researchers used spatial data analysis and models to analyze data from 237 regions between 1993-2002. Their findings suggest that the growth of a region's GDP per capita is positively influenced by the growth of nearby regions. The study also tested the results for accuracy using different statistical methods.