Invasive species have been a problem since the first decision in moving an animal, plant or insect to make life easier in the Stone Age.  In fact one way to date native american artifacts of the Americas is the presence of dandelion imagery. If the Native american artifact has a dandelion symbol on it, archeologist can date it to after the appearance of European settlers who brought the dandelion with them from Europe. Today, most recognize that "non-indigenous" or "non-native" plant or animals can adversely affect the habitats and bioregions they invade economically, environmentally, and/or ecologically. Examples reeking havoc in the USA include Kudzu and  Asian Carp from Japan, Cheatgrass, Russian Olive, and  English Ivy from Europe.

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Rogue Genetically Modified Corn has now invaded areas where farmers never planted it. Pollen drift cannot be contained so the GM pollen has spread to the heritage species of corn . Mexico is long believed to be the place where corn developed over thousands of year of cultivation. Scientists looking to preserve the original corn species and collect seeds for future research travelled far into Mexico yet not one type of corn was free of GM genes..  Contemporary Invasion now can include GM pollen contamination.