Americans will be celebrating their Independence Day the day after tomorrow.

As the birthplace of the so-called craft beer revolution, and home to about 3,400 breweries, they have plenty to celebrate. Here are six great American beers to help you celebrate too.

Over the past 30 years or so, American breweries have been changing the way people drink and think about beer, not just in the US but all over the world, from Bristol to Brazil, Aberdeen to Auckland, exporting not just bottles of good beers, but also the innovation and reinvention, and, crucially, hops such as Amarillo, Cascade and Simcoe.

But it wasn't always so. Not so long ago, way back in 1983, there were only 80 breweries operating in the US; the bulk of them producing the insipid pale ale that too many people still think of as American beer. But a handful of micro-breweries, mostly born out of scaled-up homebrewing kits, were crossing European styles with the hops in their own back yard, brewing new flavours, reinventing styles such as the IPA and English bitter, while more established breweries, such as Anchor Brewing, were growing their fanbase, upping operations and selling interstate.

As happens in America, things then moved fast. By 1994, 80 breweries had become 400; by 2003 it was about 1500, and last year the total was about 3,400.

Nowadays, good American beers are a common site on the shelves on British supermarkets and beer shops. So much so that we've come to expect the presence of Stone Brewing, or Goose Island or Brooklyn, sitting alongside our own BrewDog, Black Isle or Williams Brothers.

So, this Saturday, let's celebrate America's independent brewers. Try these six for starters.

Anchor Porter (5.6%) by Anchor Brewing Company (California)

A classic that dates back to 1972. Aroma is spicy earthiness, with hints of rum, prunes and pine forest. Taste-wise, it's smooth vanilla and roasted sweet malts, toasted coconut, nectarine and coffee, easing into a gentle, bitter finish. Beautifully textured, this is the benchmark for porters.

90 shilling (5.3%) by Odell Brewing (Colorado)

A take on the Scottish ales, and dating from 1989. Aroma is light roasted malt with spices, earth and acorns. Initially peppery, it closes with a sweet aftertaste, while notes of pineapple, gingerbread and blackberry are all served up along the way. It's dark amber, complex, medium bodied and very well weighted.

Torpedo Extra IPA (7.2%) by Sierra Nevada Brewing Company (California)

The brewery may dates form 1979, but this deep gold "hop bomb" is only a few years old, dating from 2009. Aroma is a blast of pungent hops, floral with hay, new carpet and sports mixture sweeties. The big hop flavours continue on tasting, where you're hit by a sensory explosion in your mouth - pine resin, Galia melon and pear, before moving to a lip-smackingly bitter and dry finish.

Arrogant Bastard (7.2%) by Stone Brewing Co (California) (7.2%)

Stone have only been around since 1996, though it feels like they've been around for far longer, such is the impact they've made. In under two decades they've gone from brewing 10,000 pints to about 700,000 pints, and they're now the largest brewery in Southern California. One of their most famous beers is Arrogant Bastard, another big beer that's big on hops and alcohol. It's a brooding coppery amber ale, with sweet caramel malts, vanilla and smokiness, but it's the whack of pine resin hops that dominates from beginning to end.

Gonzo Imperial Porter (9.2%) by Flying Dog (Maryland)

Anchor might have the humble porter nailed but it's Flying Dog who have one of the greatest Imperial Porters around. This pours black, sultry, sexy. Aroma is coffee, liquorice, vanilla and sultanas; taste-wise it's an absolute joy. The roasted coffee and liquorice are there, as is a balancing sweetness with vanilla and stone fruits, ending in a smooth bitter finish. A joy.

Brooklyn Lager (5.2%) by Brooklyn Brewery (New York)

Pours a soft gold with a citrus oranges and sweet mandarins, and made with both German and US hops. Crisp and deliciously refreshing, it's a prime example of a great American lager.