Here are six charts that look at how the world's top two economies and their financial markets have performed in the year.
Growth in gross domestic product — the broadest measure of an economy — slowed down in both the U.S. and China last year.
Several economists predicted that growth rates in both countries could moderate even more in 2020, due to their continued trade friction and respective domestic challenges. That would add pressure to an already fragile global economy.
Overall exports and imports fell in both countries in the first ten months of 2019, compared to a year ago. That came amid slower trading activity worldwide — a trend some experts said started even before the U.S.-China trade war.
The overall U.S. trade deficit, mostly contributed by a bilateral imbalance with China, hasn't changed much in the year. That's despite the U.S.-China trade imbalance falling from $344.5 billion in the January-to-October 2018 period to $294.5 billion a year later, according to data by the U.S. Census Bureau.
The manufacturing sectors of the U.S. and China have felt the pinch of a slowing global economy, which was made worse by the trade war between the two countries.
China's official manufacturing Purchasing Managers' Index — a widely watched indicator of the sector's health — has stayed in contraction territory for most of the year. That means the index came in below the 50-point level. In the U.S., the manufacturing PMI compiled by the Institute for Supply Management showed factory activity contracting since August.
Consumer spending in the U.S. and China were among the bright spots of their respective economies in 2019, supported by a steady labor market in both economies.
But there are risks the optimism may not sustain.
Some analysts warned that additional U.S. tariffs on Chinese goods could dampen spending among American consumers. In China, rising pork prices may cut consumer spending in other areas, said Francis Tan, investment strategist at Singapore's UOB Private Bank.
A relatively strong U.S. economy and investors' preference for safe-haven assets increased demand for the greenback, lifting the currency's value for 2019.
In contrast, Chinese authorities allowed the yuan to depreciate for most of the year. That move attracted accusations of currency manipulation from U.S. President Donald Trump, but the International Monetary Fund said the value of the yuan was in line with China's economic fundamentals.
In financial markets, rate cuts by the Federal Reserve and receding trade war tensions during certain periods in the year supported investor sentiment and sent stocks on Wall Street to multiple new highs this year despite weak corporate earnings.
Over in China, the inclusion of Chinese stocks into major global benchmarks helped the Shanghai Stock Exchange Composite Index to record a double-digit climb in 2019.