During the first three season the ARC operate only in the UK, with the only exeption beign the anomalies that appear in the novels.

During season 4 and 5 we discover that the ARC has a device to locate the anomaly in every part of the world: so how they deal with those anomaly?

Before the anomaly detection device update in series 4 Lester would have probably said "Out of sight out of mind", but once the detector was updated and anomalies would have started to be tracked all around the world he should have done something.

In my opinion the ARC created subdivisions of the special forces which it then spread to the rest of the world, so when an anomaly arose a team of soldiers would be ready to intervene to keep the incursion under control. So then why this team does not shows up in New World?

My answer is that they where active during the first episode but then sent to retreat from episode 2 onwards.

I think that during the event prior to the first episode, where the stanley park anomaly opened up several times, the team was trying to deal with the incursion but Evan Cross showed up and finaly found the anomaly. In the later days they kept undercontroll Evan and discovered that he knew something about the anomaly, so they contacted Lester who sent Connor to deal with the guy. After this the event of episode 1 take place. After seeing that the Special Project group was able to limitate the damege made by the creature, and seeing the fact that they where doing research on the anomaly, Lester decided to suspend the canadin special forces division but he probably left there some spies to have update on tehy're research. During the event of episode 2, this team was ready to act if the situation would have gone out of controll for the SPG: however, seeing how they succesfully treated the incursion, the special forces team was completly suspeded from Canada and the only members of that team that stayed there where the spies.

So, what do you think of this paragraph: It could be a legit thing or is it just me fanfictioning. Let me know your toughts in the comments.

PS: And if you have an other theory on how the ARC deal with this kind of anomalies write it in the comments as well.