> From a national security point of view it seems a few well placed bombs in about 10 data centers will take out most of the US computing power.

AWS has 13 US-based availability zones, each of which has, as I understand, multiple DCs.

GCP has a similar architecture with 16 US-based zones and 3 more standing up imminently.

Azure has a similar architecture, but separate AZs within regions are newer for Azure, and I can't find detailed information as readily, but they look to have 8 US regions,at least four of which are multi-AZ, so at least 12 zones, each with one or more DCs.

And that's 41 zones, many of which have multiple DCs, with just three big public cloud providers; I don't think 10 DCs gets you most of the computing power.

This project resides in GovCloud, which is just `us-gov-west-1` right now, I believe.

Looks like I am incorrect, us-gov-east exists as well. My project only has access to west right now. https://aws.amazon.com/blogs/aws/aws-govcloud-us-east-now-op...

> This project resides in GovCloud, which is just `us-gov-west-1` right now, I believe.

GovCloud East is also up, but the GovCloud West region's 3 AZs plus GovCloud East aren't all of US (or even “US government on public cloud”) compute (AWS also has Secret Region, Azure has two government non-secret regions and two secret regions; GCP doesn't have a government region but federal government agencies use regular commercial GCP regions—that’s true of AWS and Azure, too, the government offerings are approved for high-impact use whereas the general offerings have a lower-impact approval; Google is seeking to also get the High impact approval for their commercial offering, rather than having a distinct region IIRC.)

I don't know how you define datacenter. An AZ could be a different building on the same campus. These are Google's main locations. As you can see there are only 9:

https://www.google.com/about/datacenters/inside/locations/in...

AWS AZs are really separate from each other (separate power and network)

Quoting from the docs [1]:

Each AZ can be multiple data centers (typically 3), and at full scale can be hundreds of thousands of servers. They are fully isolated partitions of the AWS Global Infrastructure. With their own power infrastructure, the AZs are physically separated by a meaningful distance, many kilometers, from any other AZ, although all are within 100 km (60 miles of each other).

All AZs are interconnected with high-bandwidth, low-latency networking, over fully redundant, dedicated metro fiber providing high-throughput, low-latency networking between AZs. The network performance is sufficient to accomplish synchronous replication between AZs.

1 - https://aws.amazon.com/about-aws/global-infrastructure/regio...