From tax cuts to relaxed regulations to tariffs, each of President Trump’s economic initiatives is based on a promise: to set off a wave of investment and bring back jobs that the president says the United States has lost to foreign countries.

Mr. Trump’s tax cuts unquestionably stimulated the American economy in 2018, helping to push economic growth to 2.5 percent for the year and fueling an increase in manufacturing jobs. But statistics from the government and other sources do not support Mr. Trump’s claim about his policies’ effectiveness in drawing investment and jobs from abroad.

Foreign investment in the United States grew at a slower annual pace in the first two years of Mr. Trump’s tenure than during Barack Obama’s presidency, according to Commerce Department data released in July. Growth in business investment from all sources, foreign and domestic, accelerated briefly after Mr. Trump signed a $1.5 trillion tax-cut package in late 2017 but then slowed. Investment growth turned negative this spring, providing a drag on economic output.

In Mr. Trump’s first two years in office, companies announced plans to relocate just under 145,000 factory jobs to the United States, according to data and modeling by the Reshoring Initiative, a Washington nonprofit group. That is a record high in the group’s data, which dates back to the late 1980s, but it adds up to less than one month of average job gains in the United States in its decade-long expansion. More than half of those jobs — about 82,000 — were announced in 2017, before Mr. Trump’s tax cuts took effect.  […]