On the other hand, if one's definition of an invasion were to include any significant hostile incursion into another country's territory, even if war were not officially declared, the list could include several more entries. For example, a list compiled by Dr. Gideon Polya of La Trobe University in 2013 included the following:
Afghanistan
Austria
Bosnia
Burma
Cuba
Germany
Guam
Hungary
Italy
Japan
Korea
Libya
Macedonia
Mexico
Virgin Islands
Yugoslavia
Zaire (now Congo)"