The statement that is not true is:
"Marti encouraged the United States to incorporate Cuba."
José Martà was an advocate for Cuban independence from Spanish rule and did not promote the idea of the U.S. incorporating Cuba. In fact, he was wary of U.S. imperialism and sought to protect Cuba's sovereignty. The other statements regarding Marti's contributions to Cuban independence, the reception of his political writings, and his death on the battlefield are accurate.