Buy a home, and you also get a passport that grants the holder visa-free access to up to 150 countries 

Scroll through homes for sale in the Eastern Caribbean and it is no longer just bewitching beaches and a laid-back lifestyle being touted to woo buyers.

More and more property listings are offering a passport too – and political and social volatility in the US is said to be fuelling an upsurge in interest.

Five of the region's island nations – Antigua and Barbuda, Dominica, Grenada, St Kitts and Nevis, and St Lucia – offer such citizenship by investment (CBI) from as little as $200,000 (£145,000).

Buy a home, and you also get a passport that grants the holder visa-free access to up to 150 countries including the UK and Europe's Schengen area.

For the wealthy, the islands' absence of taxes such as capital gains and inheritance, and in some cases on income too, is another major draw. And all five of the region's schemes allow buyers to retain their existing citizenship.

In Antigua, estate agents are struggling to keep up with demand, says Nadia Dyson, owner of Luxury Locations. "Up to 70% of all buyers right now are wanting citizenship, and the vast majority are from the US," she tells the BBC.

"We don't talk politics with them, but the unstable political landscape [in the US] is definitely a factor.

"This time last year, it was all lifestyle buyers and a few CBI. Now they're all saying 'I want a house with citizenship'. We've never sold so many before."

Despite Antigua's programme having no residency requirement, some purchasers are looking to relocate full-time, Ms Dyson says, adding: "A few have relocated already."