If you want a decent public answer, then I need to know which continents are off limits to be able to help you. You are being way too vague here. Also, a lot of the help I can give is only useful when discussed privately. I obviously do not want anything to do with confidential information, and I do not need that to help people. It's just that posting certain details about yourself online is not appropriate via public websites. That is why I give my email (see profile).
Typically getting citizenship in /any/ European Union + European Free Trade Association country (minus Liechtenstein--has an immigration quota) is the best deal for an American.
The reason why? Becoming a citizen of one of these countries confers you EU or EFTA citizenship (let's just call it EU citizenship). Once you become an EU citizen, you have the right to live/work/retire in about 30 different countries. You are also always seen as "The American" with your American educational credentials and American work experience.
So, if you can just spend like 5-10 years in one of those countries (sometimes a less desirable one), get the citizenship, you can then move to somewhere more desired that is much harder to obtain citizenship in--permanently.
Usually the place to go for Americans is Ireland, where you can get citizenship in 5 years. Ireland also permits dual citizenship. Not only can you live/work/retire anywhere in the EU+EFTA: because of ties to the UK, having Irish citizenship gives you rights to live/work/retire in the UK.
Also, pay attention to who is top on this list (5 of the top 10 are in the EU + EFTA):
This means that they do not have to get their employer to do a skilled work test, which means they would otherwise have to prove that they are "not taking away a job from an EU citizen", which is a very high standard to meet.
The problem with Australia, New Zealand, and Canada, is that they have medical inadmissibility clauses in their immigration laws. This means that if you or anyone in your family is expected to (or do) cost more than $19,500 CAD/year, $8,000 AUD/year, or $7,500 NZD/year in medical or social services, or both, as an individual: you and your family are medically inadmissible to those countries and will be denied entry. If you or a family member goes over that threshold at any point, your entire family will be forced to go home and leave, even if working full-time and otherwise fully contributing and integrating into society. I would not be surprised if the UK does something like this post-Brexit.
Typically getting citizenship in /any/ European Union + European Free Trade Association country (minus Liechtenstein--has an immigration quota) is the best deal for an American.
The reason why? Becoming a citizen of one of these countries confers you EU or EFTA citizenship (let's just call it EU citizenship). Once you become an EU citizen, you have the right to live/work/retire in about 30 different countries. You are also always seen as "The American" with your American educational credentials and American work experience.
So, if you can just spend like 5-10 years in one of those countries (sometimes a less desirable one), get the citizenship, you can then move to somewhere more desired that is much harder to obtain citizenship in--permanently.
Usually the place to go for Americans is Ireland, where you can get citizenship in 5 years. Ireland also permits dual citizenship. Not only can you live/work/retire anywhere in the EU+EFTA: because of ties to the UK, having Irish citizenship gives you rights to live/work/retire in the UK.
Also, pay attention to who is top on this list (5 of the top 10 are in the EU + EFTA):
How healthy will we be in 2040? http://www.healthdata.org/news-release/how-healthy-will-we-b...
A lot of people on here also would get a job easily in Ireland, as they meet criteria for being on the Critical Skills Occupation List: https://enterprise.gov.ie/en/What-We-Do/Workplace-and-Skills...
This means that they do not have to get their employer to do a skilled work test, which means they would otherwise have to prove that they are "not taking away a job from an EU citizen", which is a very high standard to meet.
The problem with Australia, New Zealand, and Canada, is that they have medical inadmissibility clauses in their immigration laws. This means that if you or anyone in your family is expected to (or do) cost more than $19,500 CAD/year, $8,000 AUD/year, or $7,500 NZD/year in medical or social services, or both, as an individual: you and your family are medically inadmissible to those countries and will be denied entry. If you or a family member goes over that threshold at any point, your entire family will be forced to go home and leave, even if working full-time and otherwise fully contributing and integrating into society. I would not be surprised if the UK does something like this post-Brexit.