US President Barack Obama has set the tone for his re-election bid as he attacked income inequality in his third State of the Union speech.
Mr Obama emphasised the importance of an economy that works for everyone, in the nationally televised address to Congress.
The speech saw a renewed call for higher taxes on the wealthy, something Republicans strongly oppose.
The US economy is on the mend, but unemployment remains high at 8.5%.
The annual State of the Union - one of the most avidly watched events in US politics - traditionally includes policy prescriptions from the White House for the upcoming year.
'Reclaim American values'
President Obama's speech on Tuesday in the Republican-dominated House of Representatives was delivered with an eye on November's presidential election, when he will seek another four years in office.
He said: "We can either settle for a country where a shrinking number of people do really well, while a growing number of Americans barely get by.
"Or we can restore an economy where everyone gets a fair shot, everyone does their fair share, and everyone plays by the same set of rules.
"What's at stake are not Democratic values or Republican values, but American values. We have to reclaim them."
Mr Obama said the economy was bouncing back from the 2007-09 recession.
He sounded a warning to his conservative opponents, as he added: "I intend to fight obstruction with action, and I will oppose any effort to return to the very same policies that brought on this economic crisis in the first place."
Mr Obama also made a renewed call for his Buffett Rule - a principle that millionaires should not pay a lower tax rate than typical workers.
The idea is named after billionare investor Warren Buffett, who famously complained that his secretary pays a higher rate of tax than he does.
Mr Buffett's secretary, Debbie Bosanek, watched the speech alongside First Lady Michelle Obama from the gallery.
Pledging no tax increases for those earning under $250,000 (£160,000), Mr Obama said: "If you make more than $1 million a year, you should not pay less than 30% in taxes."
"Now, you can call this class warfare all you want," he added. "But asking a billionaire to pay at least as much as his secretary in taxes? Most Americans would call that common sense."
Republicans have repeatedly rejected Mr Obama's call for higher taxes on the wealthy and accuse him of resorting to class warfare to get elected again.
Mr Obama also proposed:
- tax reforms to make it less attractive for US companies to transfer jobs overseas
- allowing homeowners with privately held mortgages to refinance at lower interest rates
- a new trade enforcement unit dedicated to deter unfair practices by rival economies, such as China
A wave of unity swept over the chamber as Democratic Representative Gabrielle Giffords, who was shot by a lone gunman in Arizona shortly before the last state of the union, attended during her last week serving as a congresswoman.
Ms Giffords, who announced on Sunday that she would resign to focus on her recovery, was embraced by Mr Obama, amid resounding cheers from the chamber.
Indiana Governor Mitch Daniels, delivering the Republican Party's response to Mr Obama's speech, called it "pro-poverty".
He said: "No feature of the Obama presidency has been sadder than its constant efforts to divide us, to curry favor with some Americans by castigating others."
The speech put the political spotlight firmly back on the Democratic president, after months of focus on the Republican candidates vying to challenge Mr Obama for the White House.
Earlier, one of those contenders, Mitt Romney, was forced by political pressure to release his tax returns.
The forms revealed the private equity tycoon earned nearly $22m in 2010 and paid an effective tax rate of about 14%, a lower rate than most other Americans pay.
On Tuesday morning, the former Massachusetts governor held his own "prebuttal" on the campaign trail in Tampa, Florida, saying that the "real state of our union" was high unemployment and record home foreclosures.
Mr Obama will promote the ideas outlined in his speech over the coming days in five states key to his re-election bid: Iowa, Arizona, Nevada, Colorado and Michigan.
Opinion polls show his approval numbers languishing beneath 50%, with most Americans disapproving of how he has handled the economy.
More than 13 million people are out of work and government debt stands at a record high of $15.2 trillion (£9.7 trillion), up from $10.6 trillion when he took office.
However, surveys also show that Congress is far less popular than Mr Obama, with many blaming Republicans more for the gridlock in Washington.
Partisan warfare on Capitol Hill almost shut down the federal government three times last year.