The 1st seven databases contain comparative INTERNATIONAL COUNTRY LEVEL statistics. Time series data can be downloaded for use in statistical analysis and regression analysis classes. Data is generally available back to the 1980s The 2nd set of databases are focused on US statistics or for an individual country.
Use the PASSPORT database first.
These databases contain in-depth articles and information on this subject. Econlit and NBER are the most important to start your research with.
Contact your regional library for help.