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I remember seeing the monk parakeets when we were there a few years ago. Quite bizarre, we actually have multiple populations ofI'm no Zookeeper Gabe's but I'm pretty sure it varies quite a lot. European and chinese mantis were both voluntarily introduced, aka sold to farmers as pest control in the late 1800's ... With hints of european ones arriving randomly by boat as early as the 1600's. So there is both the "date of arrival" and the "way of arrival" that matters in how the specie is locally seen with of course the whole "does it integrate nicely in the ecosystem or does it fucks everything up?" side.
In Paris we now have wild populations of green parakeets spreading in the nearby woods and parks, streaming from escaped pet birds that adapted well . From what I gathered they are no threat for the local birds, apart probably for some food competition in the winter. On the other hand we have the louisiana crawfish, introduced by fishers, that kills and eat local crawfish. The asian ladybeetle does basically the same thing, and was believe it or not introduced by "green farmers".
The whole "grey squirrels" vs "red squirrels" in UK is quite a show too.
Those in the states as well. Supposedly one near the airport here in Rhode Island.